@serwist/webpack-plugin/src/lib/get-script-files-for-chunks.ts

A plugin for your webpack build process, helping you generate a manifest of local files that should be precached.

/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
import path from "node:path";
import type { Compilation, WebpackError } from "webpack";

import { resolveWebpackURL } from "./resolve-webpack-url.js";

export const getScriptFilesForChunks = (compilation: Compilation, chunkNames: string[]): string[] => {
  const { chunks } = compilation.getStats().toJson({ chunks: true });
  const { publicPath } = compilation.options.output;
  const scriptFiles = new Set<string>();

  for (const chunkName of chunkNames) {
    const chunk = chunks!.find((chunk) => chunk.names?.includes(chunkName));
    if (chunk) {
      for (const file of chunk?.files ?? []) {
        // See https://github.com/GoogleChrome/workbox/issues/2161
        if (path.extname(file) === ".js") {
          scriptFiles.add(resolveWebpackURL(publicPath as string, file));
        }
      }
    } else {
      compilation.warnings.push(new Error(`${chunkName} was provided to importScriptsViaChunks, but didn't match any named chunks.`) as WebpackError);
    }
  }

  if (scriptFiles.size === 0) {
    compilation.warnings.push(new Error(`There were no assets matching importScriptsViaChunks: [${chunkNames.join(" ")}].`) as WebpackError);
  }

  return Array.from(scriptFiles);
};